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Comprehensive
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corpus luteum a ductless gland which forms within the ovary, resulting from the reorganization of a follicle upon release of its ovum. [1/2 definitions]
spleen a ductless organ on the left side near the stomach, which filters and stores blood, destroys certain worn-out red blood cells, and produces certain white blood cells of the immune system. [1/2 definitions]
thymus a vestigial ductless gland or glandular structure found in vertebrates, usu. at the base of the neck, that is active during childhood in modifying white blood cells and building resistance to disease, but becomes inactive in the adult.